From http://javaevangelist.blogspot.com/2010/01/jsf-phaselistener-example.html

PhasePrinterListener.java

package com.bluelotussoftware.jsf.phaselisteners;

import java.util.logging.Logger;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;

/**
 *
 * @author John Yeary <[email protected]>
 * @version 1.1
 */
public class PhasePrinterListener implements PhaseListener {

    private static final Logger logger = Logger.getLogger("global");
    private static final long serialVersionUID = 3131268230269004403L;

    /**
     * Creates a new instance of PhasePrinterListener
     */
    public PhasePrinterListener() {
    }

    @Override
    public void afterPhase(PhaseEvent event) {
        logger.info("After - " + event.getPhaseId().toString());

        if (event.getPhaseId() == PhaseId.RENDER_RESPONSE) {
            logger.info("Done with request!\n");
        }
    }

    @Override
    public void beforePhase(PhaseEvent event) {

        if (event.getPhaseId() == PhaseId.RESTORE_VIEW) {
            logger.info("Processing new request!");
        }
        logger.info("Before - " + event.getPhaseId().toString());
    }

    @Override
    public PhaseId getPhaseId() {
        return PhaseId.ANY_PHASE;
    }
}